History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
but looked to the defence of the city and kept it quiet, as far as possible. He was, however, continually sending out cavalry, to prevent the advanced guard of the army from falling on the estates near the city and ravaging them. There was also a skirmish of cavalry at Phrygia, between one squadron of the Athenian horse, joined by some Thessalians, and the cavalry of the Boeotians, in which the Athenians and Thessalians had rather the advantage, until, on the heavy-armed coming to the succour of the Boeotians, they were routed, and some few of them killed: they took up their bodies however on the same day without a truce;
and the Peloponnesians erected a trophy the day after. This assistance on the part of the Thessalians was given to the Athenians on the ground of their ancient alliance; and those who came to them consisted of Larissaeans, Pharsalians, [Parasians,] Cranonians, Pyrasians, Gyrtonians, and Pheraeans. Their commanders were Polymedes and Aristonus, each from his own faction, and Menon from Pharsalus. The rest also had their commanders according to their respective cities.